"Avast only block a site if it is infected/malicious/suspect/ not because it doesn't like them."That is not true. The site is not opened at all, Avast does not check the site at all - it aborts the connection becase the site is on a blacklist.
The details in the Avast window are like this:
We've safely aborted connection on
www.SITE.cz because it was infected with URL: Blacklist. (tomamar: what kind of infection is that?)
Threat name: URL: Blacklist
Threat type: Miscellaneous - this is malicious software that could harm your data, computer or network. (tomamar: sorry, this does not add up at all)
How could avast detect a "malicious software" called "URL: Blacklist" when it does not even allow to open the web? It simply makes no sense and based on the behavior and lack of other info, I suspect Avast from keeping a blacklist and censoring my internet access based on it. I may of course change my mind if you can clarify what SW is "URL: Blacklist" and how does Avast know this is on the site even before Chrome has a chance to access it.
EDIT: one extra piece of info - the error that Chrome gives is the standard
This site can’t be reached The connection was reset.
Try:
Checking the connection
Checking the proxy and the firewall
Running Windows Network Diagnostics
ERR_CONNECTION_RESETI.e. Avast is in the way of Chrome reaching to a site. IMHO very different from a situation where I am browsing an infected page which is something Avast would detect when the page is being loaded. Not when it blocks Chrome from reaching it (i.e. nothing is loaded and examined by Avast, it simply works as a censor).